The following exception is thrown when you try to use one application with the another database. The problem is caused by asp.net membership provider which cannot recognize its schema.
The 'System.Web.Security.SqlMembershipProvider' requires a database schema compatible with schema version '1'. However, the current database schema is not compatible with this version. You may need to either install a compatible schema with aspnet_reqsql.exe (available in the framework installation directory), or upgrade the provider to a newer version.
First of all be sure the aspnet membership provider is registered on that database using aspnet_regsql.exe.
Then the solution is: taking the web application offline and then online using Web Site Administration Tool. That makes some changes in web.config in the pages tag and globalization if needed. Then you can go!